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  • 12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.

16.   12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell  whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.

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Total number of pens = 132(good) + 12(defective)

Hence, total possible outcomes = 144

Number of good pens = number of favourable outcomes = 132

\therefore P(getting\ a\ good\ pen) = \frac{favourable\ outcome}{total\ outcome} = \frac{132}{144} = \frac{11}{12}

Posted by

HARSH KANKARIA

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